For all the outdoor APs as below, 200~300 meter range is just a piece of cake.
http://www.tp-link.com/en/products/biz-list-37.html

While you also need to pay attention that the wireless communication is bi-directional, so you can post your detailed requirement here.

I need to buy a directional router.. which is cover only a certain direction.i have 30+ mobile wifi users. I want they can use my wifi signal by my directional router... they are located in south part of my house. so i want to place my router in south part that it can cover only south part 200-300 meters or more..

I have to say, although TP-Link outdoor APs can cove a range of 200-300 meters, but the mobile phones can't receive a wifi signal 200 meters away. All because the wireless communication is mutual.